description Ceramium rubrum Overview
Ceramium rubrum is a name historically applied to a filamentous marine red alga of temperate shores, with erect, repeatedly branched fronds that commonly grow on rock or other seaweeds. The name is taxonomically unsettled in older literature: AlgaeBase lists Ceramium rubrum C. Agardh as a synonym of Ceramium virgatum Roth, while some regional records have used the older name. It is therefore relevant to herbarium, field, and biodiversity records where names must be interpreted in context.
[AlgaeBase](https://www.algaebase.org/search/species/detail/?species_id=Jf389299d41ce1b09)
help Ceramium rubrum FAQ
What is Ceramium rubrum?
Ceramium rubrum is a name historically applied to a filamentous marine red alga. The name is taxonomically unsettled in older literature, so historical records may not map neatly to one accepted modern species.
What does Ceramium rubrum look like?
Descriptions under this name refer to erect, repeatedly branched fronds. The alga commonly grows on rock or attached to other seaweeds on temperate shores.
Is Ceramium rubrum a red or brown alga?
It is treated as a red alga in the historical usage of the name. Its filamentous, repeatedly branched fronds are typical of the genus Ceramium.
Why is the name Ceramium rubrum difficult to use?
The name has been used inconsistently in older literature, and its taxonomy is unsettled. AlgaeBase lists Ceramium rubrum with an author citation, but the exact application of historical records may require specialist review.
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